I found a way to be pretty effective : Claiming to be able to.
For example : It was one of my goals to control fire. At first, I just tryied to do it by focusing but the results were really disappointing.
Then I shouted "I can control fire !" and the results came immediatly. That way, you give the task of making you able to the dream itself therefor you can do it yourself !

It is widely discused in Wagonner's book and I learned so much from it.